1. Have both sharp and soft light-sources...
Sharp will do great for reflections/highlights on polished watch surfaces, while the smooth light will give nice ambience.
2. Put the cam on a tripod or a steady surface.
3. ISO 100 unless you want grainy pics.
4. Find the right Whitebalance (Check your cam's manual)
5. Select one-point focus, so that your autofocus does not switch over to a bad focuspoint.
6. Have a nice arm/wrist and choose a jumper/shirt/suit that picks up some of the colors of the watch/dials/numbering/etc!
7. Avoid clutter in the background (Ie. unpaid bills, socks, filthy apartment etc.)
8. No flash!! Unless you can move/position it away from the camera or towards the roof.
9. Decide if you want to have the background come out as blurry or sharp!! (good example: http://www.cameratown.com/guides/assets/ap...comparison.jpg)
Regards BM